How to write to file in Java – FileOutputStream
In Java, FileOutputStream is a bytes stream class that’s used to handle raw binary data. To write the data to file, you have to convert the data into bytes and…
How to read file in Java – BufferedInputStream
Here is another example to show how to read a file in Java with BufferedInputStream and DataInputStream classes. The readLine() from the type DataInputStream is deprecated. Sun officially announced this…
How to set the file permission in Java
In Java, file permissions are very OS specific: *nix , NTFS (windows) and FAT/FAT32, all have different kind of file permissions. Java comes with some generic file permission to deal…
Java : getResourceAsStream in static method
In non static method, we use getClass() of the object or instance. In static method, the getClass() method will be failed, and prompts Cannot make a static reference to the…
How to get the environment variables in Java
In Java, the System.getenv() returns an unmodifiable string Map view of the current system environment. If a requested environment variable is not defined, the System.getenv will return a null, and…
Java Properties file examples
Normally, Java properties file is used to store project configuration data or settings. In this tutorial, we will show you how to read and write to/from a .properties file. The…
How to sort a Map in Java
Few Java examples to sort a Map by its keys or values: (1) Uses java.util.TreeMap, it will sort the Map by keys automatically, (2) Yet another java.util.TreeMap example, provide a…
Java 8 – How to sort a Map
Java 8 Stream examples to sort a Map, by keys or by values. Steps to sort a Map in Java 8: (1) Convert a Map into a Stream, (2) Sort…
Java – How to display all System properties
In Java, you can use System.getProperties() to get all the system properties. Also by sorting, you can display all the system properties in Alphabetical order.
How to detect OS in Java
This article shows a handy Java class that uses System.getProperty("os.name") to detect which type of operating system (OS) you are using now. This code can detect Windows, Mac, Unix, and…